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Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
ASSETS |  |
Cash and cash equivalents | $ 25,497 | $ 28,948
Short-term investments | 287 | 1,061
Accounts receivable, net of allowance of $5 and $51 at December 31, 2011 and 2010, respectively | 6,096 | 4,792
Inventories | 6,444 | 5,957
Prepaid expenses | 810 | 681
Other current assets | 605 | 316
Total current assets | 39,739 | 41,755
Non-current assets: |  |
Property and equipment, net | 2,032 | 2,390
Goodwill | 1,316 | 1,316
Intangible assets, net | 1,748 | 1,950
Restricted cash | 303 | 305
Other assets | 229 | 451
Total assets | 45,367 | 48,167
LIABILITIES AND STOCKHOLDERS' EQUITY |  |
Accounts payable | 4,680 | 3,230
Accrued liabilities | 5,825 | 6,003
Deferred revenue | 111 | 248
Debt-current | 2,519 | 1,747
Capital lease obligations-current | 0 | 10
Warrant liability | 7,979 | 8,465
Total current liabilities | 21,114 | 19,703
Non-current liabilities: |  |
Debt-non-current | 4,697 | 3,131
Capital lease obligations-non-current | 0 | 6
Other non-current liabilities | 1,243 | 1,595
Total liabilities | 27,054 | 24,435
Commitments and contingencies |  |
Stockholders' equity: |  |
Preferred stock, $0.001 par value 5,000 shares authorized, issuable in series; 3 shares issued and outstanding at both December 31, 2011 and 2010; aggregate liquidation preference of $9,496 at December 31, 2011 and 2010 | 9,496 | 9,496
Common stock, $0.001 par value 112,500 shares authorized; 51,211 and 47,329 shares issued and outstanding at December 31, 2011 and 2010, respectively | 51 | 47
Additional paid-in capital | 452,701 | 441,034
Accumulated other comprehensive income | 0 | 108
Accumulated deficit | (443,935) | (426,953)
Total stockholders' equity | 18,313 | 23,732
Total liabilities and stockholders' equity | $ 45,367 | $ 48,167

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- Definition Investments in debt and equity securities which are categorized neither as trading securities nor held-to-maturity securities and which are intended be sold or mature within one year from the balance sheet date or the normal operating cycle, whichever is longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. 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